When a British archaeologist who had been missing for two years reappears, frantic and delirious, but dies before he can tell his story, Sigma Force must stop an ancient plague with ties to some of history's most innovative minds.

Wrongfully fired from their counterterrorist unit, operator Pike Logan and his partner investigate the disappearance of an exchange student while Taskforce teams are threatened by terrorists to cease operations at the risk of high-profile hostages.

After a pregnant woman is kidnapped by Somali pirates, Sigma Force, with the help of former army ranger Captain Tucker Wayne and his military war dog Kane, finds this rescue mission turning into a conspiracy of epic proportions.

When the Titan Project, an international research station off the coast of Australia, is attacked, setting in motion a large-scale geological disaster, Sigma Force races against time to stop the world from burning, uncovering something that will shake the very foundations of humanity.

When the President of Russia secretly buys an air freight company to transport dangerous cargo to the United States, Brad McLanahan and the heroes of the Iron Wolf Squadron join forces with the new Alliance of Free Nations in Eastern Europe to stop the imminent attack.

When a remote military research station is decimated, Commander Gray Pierce and the Sigma Force must solve a mystery from Antarctica's distant past using an ancient map that leads them to a new form of death, which could result in mankind's extinction.

When his covert company, along with every other entity in the Taskforce, is hit with a ransomware attack linked to the Taliban, Pike must stop a plot to alter the balance of power on the global stage orchestrated by a former NSA specialist in the U.S. government.

As Syria's government unravels and ISIS emerges, planning to unleash a sarin gas attack across the entire Middle East, Crocker and the rest of SEAL Team Six must race against time to stop a ruthless killer and keep an explosive plan from detonating.

Thomas Crocker and his team of Navy SEALs head to Mexico after a U.S. Senator's wife and teenage daughter are kidnapped by the Jackal, a ruthless drug lord.